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Results of an Investigation of Forward and Backward Extrusion with FEM

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Results of an Investigation of Forward and Backward Extrusion with FEM Program QForm

B. Moroz, Don State Technical University, S. Stebunov, and N. Biba, QuantorForm, Ltd., and К. Mueller, Forschungszentrum Strangpressen, Technische Universitaet Berlin

Track: EXTRUSION PROCESS - Extrusion Process

ABSTRACT --- The paper presents a finite element model based on the QForm FE
program for simulation of extrusion. It presents forward, backward, and active friction
force extrusion simulation results. Dependence of the consideration for boundary
conditions made it possible to obtain design material flow patterns in the container as
functions of the value and direction of the friction forces between the billet and the
container corresponding to the pilot data. We have analyzed material flow features in
pressing out the billet from the container. We have obtained the distribution of contact
pressures/normal stresses on the extruder plate, container, and die surfaces during
forward and backward extrusion. The software calculates the full extrusion force and
its components with a high accuracy. It permits one to define the thermal pattern in the
billet considering its cooling in air and during the contact with the tool, and to obtain
information about the stresses, strains and thermal state throughout the entire forming
process, not only in the billet being extruded but, at points of interest for the
researcher as well. We have quantified billet deformation features in the container and
those of changing backward extrusion force parameters, which give positive testimony
to the presence of active friction forces in the initial stage of the process. We have
defined the most suitable conditions for the initial extrusion phase with friction forces
acting synergistically in the specified kinematical conditions.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.

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